Adding mouse wheel support for out-of-browser applications on the Mac platform

Various media-related fixes around DRM content

Fixed memory leak when MouseCapture is used

Fixed memory leak for DataTemplate usage

For Users

Tim aptly points out that if you want to encourage your end users to upgrade to this new Silverlight version then you will want to set the minRuntimeVersion parameter in the object tag hosting your Silverlight control to 4.0.50826.0. You’ll also want to set autoUpgrade to true.